In guard cells when sugar is converted into starch, the stomatal pore

1. Opens partially
2. Closes completely
3. Opens completely
4. Remains unchanged

It is a common observation that CAM plants are not tall. The reason most likely is:

1. They would be unable to move water and minerals to the top of the plant during the day.

2. They would be unable to supply sufficient sucrose for active transport of minerals into the roots during the day or night

3. Transpiration occurs only at night, and this would cause a highly negative $\mathrm{\psi }$ in the roots of a tall plant during the day.

4. Since the stomata are closed in the leaves, the Casparian strip is closed in the endodermis strip is closed in the endodermis of the root.

A plant requires potassium for:

(1) Holding its cells together

(2) Synthesizing chlorophyll

(3) DNA replication

(4) Opening and closing its stomata

Which one gives the most valid and recent explanation for stomatal movements?

1. Transpiration

2. Potassium influx and efflux

3. Starch hydrolysis

4. Guard cell photosynthesis

Stomatal opening is affected by 

(1) nitrogen concentration, carbon dioxide concentration and light

(2) carbon dioxide concentration, temperature and light

(3) nitrogen concentration, light and temperature 

(4) carbon dioxide concentration, nitrogen concentration and temperature 

Glycolate induces opening of stomata in

(1) Presence of oxygen

(2) Low ${\mathrm{CO}}_2$ concentration

(3) High ${\mathrm{CO}}_2$ concentration

(4) Absence of ${{\mathrm{CO}}_2}_{}$

The immediate cause of opening and closing of stomata is a change in the

The inner wall of guard cell is not

The opening of stoma is also…….due to the orientation of the microfibril in the …….

of guard cells.

Microfibril of Guard cells of stoma are not